Q&A Running Firefox with Lastpass in Sandboxie?

Firefox is very slow to fully load in Sandboxie(paid) and I'm sure the problem is the Lastpass extension. Without Lastpass it opens in under 10 seconds, with Lastpass about 30 seconds.
Does anyone know what settings may improve this(I'm afraid I know very little about Sandboxie's settings/options).
I did find a post(below) on Sandboxie's forum in which somebody suggested some settings but were unsure whether they were safe.

Judging by the template, it looks you're providing only read access and no writes. So, Lastpass cannot save passwords for new websites. I haven't used Sandboxie. Let other experienced people @MT take a look at it.

Firefox is very slow to fully load in Sandboxie(paid) and I'm sure the problem is the Lastpass extension. Without Lastpass it opens in under 10 seconds, with Lastpass about 30 seconds.
Does anyone know what settings may improve this(I'm afraid I know very little about Sandboxie's settings/options).
I did find a post(below) on Sandboxie's forum in which somebody suggested some settings but were unsure whether they were safe.

Trusted

Hello LittleDude. As yourself, I have browsed using Firefox within Sandboxie while also utilizing LastPass' encryption security.
Although I have never altered the settings for LastPass due to noticeably slower reaction times, I've also experienced slowness while using Firefox & LastPass (extension 3.3.1.) and it has proven inherently slower for us than when we've used the Chromium sourced Slimjet browser Fastest web browser that blocks all ads and protects your privacy - Slimjet & LastPass (newer extension version 4.1.28). There may be other variables when using the LastPass extension & sandboxie combination in addition to the browser/extension versions used. You may even consider refreshing your Firefox browser. Syncing helps smooth out starting fresh if you decide to try this. Apart from using Chrome or another similar browser, we have had more responsive times whilst using alternate 64 bit browsers in favor of Firefox, namely 8pecxstudios Cyberfox, although Slimjet browser has worked fastest for us.
I hope this helps you.

I asked the question on the Sandboxie forum. Got no response so I emailed support. They told me to use the forum.
I'm can't tell if there is actually any real support or if you are relying on fellow users to help you.

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